package Test1;

public class Computer {

    public void poweroff(){
        System.out.println("关闭电脑");
    }

    public void poweron(){
        System.out.println("打开电脑");
    }

    public void useDevice(IUSB usb){

        usb.openDevice();
        if(usb instanceof  Mouse){
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }
        if (usb instanceof KeyBoard){
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.inPut();
        }
        usb.closeDevice();
    }

    public static void main(String[] args) {
        Computer computer = new Computer();
        computer.poweron();

        computer.useDevice(new KeyBoard());
        computer.useDevice(new Mouse());

        computer.poweroff();

    }
}
